RE: savage motors
Whatever your budget allows.
I have seen this question a million times!
That is like asking "What color shirt should I wear?"
Because you are a noob, I will cut you some slack. There are several good choices under $200 (Collari .30 is my next buy). Stay away from the Diablo .28, Wasp .28, etc. as they can be difficult to tune and may have a short life span.
The SH .28 has tons of torque and wheelies everywhere, but does not have a really high peak RPM (28K).
What is your budget and what do you plan on doing with your truck?